cut someone to the quick

cut someone to the quick

If something cuts you to the quick, it makes you very upset. The cruelty of their words cut me to the quick. That tone of hers always cut him to the quick. Note: The quick is the very sensitive flesh under the fingernails or toenails.
See also: cut, quick

cut someone to the quick

cause someone deep distress by a hurtful remark or action.
Quick means an area of flesh that is well supplied with nerves and therefore very sensitive to touch or injury.
See also: cut, quick